Improvement in saw-sharpening machines



z Shets-Sheet 1.

M. covE'L. SAW SH'ARPENING MACHINES. v 11 ,180,115, Patented July 25, 1876.

WITNESSES. I INVENTDF! 2 Sheets'Shee Z.

M. COVEL. SAW SHHARPENING MACHINES.

Patented July 25, 187-6 INVENTDR WITNESSES NiFEI'ERS. PNOTO-I-VTHOGWAPHER, WASHKNGTON D C UNITED STATES PATENT-OFFICE.

MILO OOVEL, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN SAW-SJHARPENING MACHlNES.

Specification forming part of Letters Patent No. 180, 1 [5, dated July 25, 1876; application filed April 26, 1876.

To all whom it may concern Be it known that I, MILO GOVEL, of Ohicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Saw-Sharpening Machines; and I do hereby declare that the following is a full, clear, and exact description of the same, and which will enable others skilled in the art to which my invention appertains to make and use my improvements, reference being part hereof, and in which- Figure l is a front elevation of a machine embodying my invention; Fig. 2, a side elevation thereof; Fig. 3, a top or plan view of the same; Fig. 4, a rear elevation of the guide or former; Fig. 5, a vertical cross-section in the plane of the line as m; Fig. 6, a side elevation of a straight saw, arranged in a fastening adapted for attachment to a sharpeningmachine; Fig. 7, a top or plan view of the parts shown in Fig. 6; Fig. 8, an end elevation of the same, and Fig. 9 a perspective view of machine.

Like letters of reference indicate like parts.

This invention. relates to that class of sawsharpening machines which are automatic in their action.

My object is to improve, in several respects, the construction and operation of this class of machines; and to that end my invention consists in the several novel features hereinafter specifically set forth.

In the drawing, A represents the frame ofthe machine. B is the main driving-shaft, and O is a belt-wheel or pulley mounted thereon. D is a perpetual screw on the shaft B. E is a crank-shaft, having thereon the crankarm a; and F is a spur-wheel on the shaft E,

and is arranged to engage the screw D. G

is an intermediate driving-shaft, and EI andv H are belt wheels or pulleys mounted thereon. All these shafts have suitable bearings in the frame, and the size of the pulleys is such as -to increase the speed or motion imbearing carried by the gate J. K is a pulley -on the axle or arbor of the wheel K. The

iemery-wheel is vertically arranged, and has a beveled edge, as shown. mounted freely on a bar or bridge forming a ipart of the top I. L L are inclined pulleys, fpivotedto-the saddle L. M is a brace atftached at one end to the saddle, and the other rests against the shaft G, and the fixed .pins 0 c, the latter of which lie in a line exhad to the accompanying drawing, forming a L isv a saddle,

tending across the top piece, the brace being forked or cut or notched to receive the shaft and pins, as represented by broken lines in Fig. 3. The saddle L is capable of a slightly swinging or tilting movement on its bridge, in a'lateral direction, and in a horizontal plane, and also of a sliding movement thereon, while the part I is being shifted or adjusted. The bridge is broadest at its central part, and hence, as the saddle is pushed rearward, and reaches the narrow part of the bridge, room is left between the saddle and the bridge to admit of the tilting movement referred to. This sliding and tilting movement is caused for the reason that the brace M is at one end rigidly attached to the saddle, while the other end rests against fixed bearings some distance from the center on which the table I turns. N is adriving-belt, arranged over the pulleys C and H, and N is also a driving-belt, arranged over the pulleys H, L L, and K, as shown. The frame Ais cut away in the are of a circle, as represented at d, Fig. 3, and the center of this circle is in a line passing vertically through the center of the emerywheel. The top-piece is shouldered or lipped to lap or engage the curved part (1.

By this means the top-piece may be swung laterally, as if pivoted at a point lying in a line passing vertically through the center of the emery-wheel.

e e are holes in the frame A, and e is a pin passing through the part I, and adapted to enter any of the holes 66, so that the top-piece to be liable to leave the pulley K. O is apivoted'arm. beveled slightly on its upper and lower edges, and carrying a block, 0, adjust ably mounted thereon. I isa circular saw atatached to this block in such a manner as to be firmly held, but capable of being rotated. The arm ()is inclined, as shown, and one end may be adjusted at various heights by means of a vertical slot in the frame A and a horizontal slot near the end of thearm, in connection with a bolt passing through the slots, so

that the parts may be tightly clamped tow gether when the arm is set in any desired po-. sition. The saw may be rendered adjustable on the arm 0 by means of an adjusting-screw passing through the block 0, and through a fixed stud but as this means of rendering the saw adjustable on its supporting arm has heretofore been employed, I have not here shown an adjusting=screw arranged to perform this function, and have only intended to suggest a way of producing the result referred P is a pivoted perforated lever or arm, and P is a connecting-arm pivoted tothe gateJ, and swivel-jointed to the arm P. Q is a pitman, carried by the arm a, and connected to the arm P. The arm P and pitman Q may be adjusted on the arm P by passing their pivots through any of the perforations in the latter arm. R is a pivoted lever, on the lower end of which is fastened the former or guide.

It, arranged for contact with the free end of the arm P". This former is removable from its arm it is also slotted, as shown at f, so that it may be rocked on a pivot, f, extend ing from the lever B, and then clamped by means of a pin or nut employed in connection with a pin, f, extending; from the lever, and

passing through the slot f. The former is firmly held against the arm 1? by means of a spring, R. S is an adjustable push-pawl, pivoted to the upper endof the lever B, and

. is arranged to engage the teeth of the saw.

. In order to file circularsaws by meansot' the marhine now described, the saw isfirstfi'rmly attached to the block 0, but so as to be capable of being rotated, and the block 0 and arm 0 are then so adjusted that the emery-wheel will lie on the lowest part of any tooth, just before the arm a is at the end of its downstroke, it being understood that the arm P is also then so adjusted on the lever I as to entirely lift the emery-wheel from the teeth, and a little way above the saw, during the next upstroke of the arm a. The pawl S should also then engage the tooth against which the beveled'face of the emeryiwheel lies.

The pitman Q should also be so adjusted with relation to the lever P that the movement of the free end of the latter will correspond to the length of the teeth. If the driving-shaft is now set in motion, the continued downward movement of the arm a will cause the emery-wheel, while being rotated, to descend until the downstroke of the arm a is completed, and While the emery-wheel thus drawn downward, it also moves toward the tooth adjacent to its vertical face, and so grinds off the vertical face of this tooth, as Well as that part of the next tooth which is in contact with the beveledface ol' the emerywheel. Thislateral movement of the grinding-wheel is caused by the action of the angular slot 1) on the pin b. During this part of the downward movement of the arm a, the

pawl S was carried slightly away from the tooth against which it rested. When the upstroke of the arm a'begins, the lever 1? acts on the former R, and carries the pawl toward this tooth. As the upstroke of the arm a continues, the wheel K moves upward and toward the pawl S, owing to the reverse movement of the pin 1) in the slot b, and by the time this pin reaches the straight partof the slot the pawl has reached the tooth, and push es the saw around until another tooth is set for the action of the sharpener during the next downstroke of the arm a, and, during this downstroke, the pawl recedes to engage another tooth.

This operation is repeated, automatically, until all theteethare sharpened, it being understood that the driving-shaft may be driven by steam or other motive force.

If it is found that the sharpener is cutting the teeth away either too much or not enough, the saw, levers,arms, and pawl, or any one or more of them, may be adjusted until the work is properly done.

The saw may also be set for being filed when the arm a is at the end'of its downstroke, a corresponding adjustment of the parts being made to regulate the action of the sharpener. A little familiarity with the action of the machine willenable others to adjust it properly.

It will be perceived that the face of the former in contact with the free end of the lever P should correspond with the form of those parts of the teeth which are operated upon by the beveled face of the saw.

In order to file crosscut-saws, the part I is swung around until the emery-wheel is set at a proper angle to the saw-teetlnso as to make a beveled edge on the faces in contact with the-vertical faceof the emery-wheel. The position in the former B should be reversed with relation to the lever P, and the feed or stroke of the pawl S should be such as to rotate the saw by engaging each alternate tooth. When one half the teeth are tiled in this manner, the part I is set to the opposite quarter, and the remaining teeth are thenoperated upon.

In order to file straight saws, I remove the block 0 and apply instead thereof the parts which I will now describe.

Tis a beveled piece or jacket, removably mounted on the arm 0. U U are sliding and beveled head-blocks mounted on the part T. A shoulder, g, on the part T keeps the blocks U U. separated from each other. V is a straight saw, which has the usual end ribs h h.

V V are split links or clasps entering the parts U U, and V V are wedge-shaped blocks driven through the links or clasps V V. If the saw V is so arranged as tobe engaged or clasped by the links V V, and if the blocks V V be then driven firmly into the links V V, the saw will be stretched and tightened, and may thus be made to have the same tension as when applied to the saw-carriage or driver. The teeth. will thus beaccurately filed. All the parts adapted to be used in connection with the straight saw may be.

applied and removed with facility. The adjustment of the machine, when employed to sharpen straight saws, should 'be the same as already described.

Having thus described my invention, what i I claim as new, and desire to secure by Letters Patent, is-

1. The arm or lever B, provided on its upper end with. a push-pawl or feeder, and on its lower end with a guide or former, in com bination with a vibrating lever connected to the sliding emery-wheel gate, substantially as and for the purposes specified.

2. The combination of the crank-shaftE, pitman Q, lever P, swivel-jointed connectingarm P, the vertically-slidinggate, carrying the emery-wheel or sharpener, and the laterally-swinging gate-carrier, substantially as and for the purposes specified.

3. The angular slot 1) in the gate-frame, in

combination with the pinb on the vertically sliding gate, substantially as and for the purposes specified.

4. The combination of the laterally-swinging gate-carrier or top-piece, saddle L, brace -M, pins 00, pulleys L L, the sharpeningwheel, and the driving-belts, all adapted for operation together, for the purposes set forth.

5. The guide or former R, pivoted to the. feed-lever R, and having therein the slot f,

in combination with the fastening-pin f, and the sharpener-actnating lever P, substantially as and for the purposes specified.

6. In combination, the beveled arm 0, beveled, removable, and shouldered jacket T, removable head-pieces U U, links or clasps V V, and tighteners V V, substantially as and for the purposes specified.

In witness whereofl have signed the foregoing specification the 10th day of April A.

MIL OOVEL.

Witnesses:

F. F. WARNER, J. H. LAWLOR. 

